Firefox debugging error. Not in chrome

Error with debugging with firefox

This is the code:

<!DOCTYPE html>
<html lang="en">

<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src=""></script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'UA-112384334-1');




Chrome debugging tools show no errors but firefox returns in the console

unreachable code after return statement js:69:1092

Chrome shows no errors.

Any ideas?
Who is Participating?
Dave BaldwinFixer of ProblemsCommented:
Firefox shows that on all pages where the 'gtag' code is used.  You can't fix it, it's in the Google code.
robrodpAuthor Commented:
I thought so. Thx
Rani KumariCommented:
There are many more issues while using the Chrome browser. One of the general issues is the error of Err Spdy Protocol. It appears when you are trying to open a new webpage. Last day when I was using the chrome this error appears again and again. Then I visit Fix Err Spdy Protocol Error for the help. I follow all the steps mentioned and now there is no such issue on my system.
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